Buggy code:
} ; protected static class SynchronizedCacheEntryFactory extends RubyModule . WrapperCacheEntryFactory { public SynchronizedCacheEntryFactory ( RubyModule . CacheEntryFactory previous ) { } @ Override public CacheEntry newCacheEntry ( String name , DynamicMethod method , int token ) { } } protected static class ProfilingCacheEntryFactory extends RubyModule . WrapperCacheEntryFactory { private final MethodEnhancer enhancer ; public ProfilingCacheEntryFactory ( Ruby runtime , RubyModule . CacheEntryFactory previous ) { } private MethodEnhancer getMethodEnhancer ( ) { } @ Override public CacheEntry newCacheEntry ( String name , DynamicMethod method , int token ) { } } private volatile RubyModule . CacheEntryFactory cacheEntryFactory ; public void becomeSynchronized ( ) { } public boolean isSynchronized ( ) { } private CacheEntry addToCache ( String name , DynamicMethod method , int token ) { } public DynamicMethod searchMethodInner ( String name ) { } public void invalidateCacheDescendants ( ) { } protected void invalidateCoreClasses ( ) { } public Invalidator getInvalidator ( ) { } public void updateGeneration ( ) { } @ Deprecated protected void invalidateCacheDescendantsInner ( ) { } protected void invalidateConstantCache ( String constantName ) { } public DynamicMethod retrieveMethod ( String name ) { } public RubyModule findImplementer ( RubyModule clazz ) { } public void addModuleFunction ( String name , DynamicMethod method ) { } public synchronized void defineAlias ( String name , String oldName ) { } public synchronized void defineAliases ( List < String > aliases , String oldName ) { } private DynamicMethod searchForAliasMethod ( Ruby runtime , String name ) { } public RubyClass defineOrGetClassUnder ( String name , RubyClass superClazz ) { } public RubyModule defineOrGetModuleUnder ( String name ) { } public RubyClass defineClassUnder ( String name , RubyClass superClass , ObjectAllocator allocator ) { } public RubyModule defineModuleUnder ( String name ) { } private void addAccessor ( ThreadContext context , String internedName , Visibility . Visibility visibility , boolean readable , boolean writeable ) { } public void setMethodVisibility ( IRubyObject [ ] methods , Visibility . Visibility visibility ) { } public void exportMethod ( String name , Visibility . Visibility visibility ) { } private DynamicMethod deepMethodSearch ( String name , Ruby runtime ) { } public boolean isMethodBound ( String name , boolean checkVisibility ) { } public boolean isMethodBound ( String name , boolean checkVisibility , boolean checkRespondTo ) { } public IRubyObject newMethod ( IRubyObject receiver , String methodName , boolean bound , Visibility . Visibility visibility ) { } public IRubyObject newMethod ( IRubyObject receiver , final String methodName , boolean bound , Visibility . Visibility visibility , boolean respondToMissing ) { } public static class RespondToMissingMethod extends JavaMethod . JavaMethodNBlock { final CallSite site ; public RespondToMissingMethod ( RubyModule implClass , Visibility . Visibility vis , String methodName ) { } @ Override public IRubyObject call ( ThreadContext context , IRubyObject self , RubyModule clazz , String name , IRubyObject [ ] args , Block block ) { } public boolean equals ( Object other ) { } } public IRubyObject newMethod ( IRubyObject receiver , final String methodName , boolean bound , Visibility . Visibility visibility , boolean respondToMissing , boolean priv ) { } @ JRubyMethod ( name = "define_method" , visibility = PRIVATE , reads = VISIBILITY ) public IRubyObject define_method ( ThreadContext context , IRubyObject arg0 , Block block ) { } @ JRubyMethod ( name = "define_method" , visibility = PRIVATE , reads = VISIBILITY ) public IRubyObject define_method ( ThreadContext context , IRubyObject arg0 , IRubyObject arg1 , Block block ) { } @ Deprecated public IRubyObject define_method ( ThreadContext context , IRubyObject [ ] args , Block block ) { } private DynamicMethod createProcMethod ( String name , Visibility . Visibility visibility , RubyProc proc ) { } @ Deprecated public IRubyObject executeUnder ( ThreadContext context , Callback method , IRubyObject [ ] args , Block block ) { <START_BUG> context . preExecuteUnder ( this , block ) ; <END_BUG> try { return method . execute ( this , args , block ) ; } finally { context . postExecuteUnder ( ) ; } } @ JRubyMethod ( name = "name" ) public IRubyObject name ( ) { } @ JRubyMethod ( name = "name" , compat = RUBY1_9 ) public IRubyObject name19 ( ) { } protected IRubyObject cloneMethods ( RubyModule clone ) { } @ JRubyMethod ( name = "initialize_copy" , required = 1 , visibility = Visibility . Visibility . PRIVATE ) @ Override public IRubyObject initialize_copy ( IRubyObject original ) { } public void syncConstants ( RubyModule other ) { } public void syncClassVariables ( RubyModule other ) { } @ JRubyMethod ( name = "included_modules" ) public RubyArray included_modules ( ThreadContext context ) { } @ JRubyMethod ( name = "ancestors" ) public RubyArray ancestors ( ThreadContext context ) { } @ Deprecated public RubyArray ancestors ( ) { } public List < IRubyObject > getAncestorList ( ) { } public boolean hasModuleInHierarchy ( RubyModule type ) { } @ Override public int hashCode ( ) { } @ JRubyMethod ( name = "hash" ) @ Override public RubyFixnum hash ( ) { } @ JRubyMethod ( name = "to_s" ) @ Override public IRubyObject to_s ( ) { } @ JRubyMethod ( name = "===" , required = 1 ) @ Override public RubyBoolean op_eqq ( ThreadContext context , IRubyObject obj ) { } @ Override public boolean equals ( Object other ) { } @ JRubyMethod ( name = "==" , required = 1 ) @ Override public IRubyObject op_equal ( ThreadContext context , IRubyObject other ) { } @ JRubyMethod ( name = "freeze" ) @ Override public final IRubyObject freeze ( ThreadContext context ) { } @ JRubyMethod ( name = "<=" , required = 1 ) public IRubyObject op_le ( IRubyObject obj ) { } @ JRubyMethod ( name = "<" , required = 1 ) public IRubyObject op_lt ( IRubyObject obj ) { }

Fix:
context . preExecuteUnder ( this , this , block ) ;